/Engine/Source/Runtime/Core/Public/Virtualization/VirtualizationTypes.h
This enum describes the reasons why a payload may not be virtualized
namespace UE { namespace Virtualization { enum EPayloadFilterReason { None = 0, Asset = 1 << 0, Path = 1 << 1, MinSize = 1 << 2, EditorBulkDataCode = 1 << 3, MapContent = 1 << 4, } } }